:root{
    --bg: #F5F6FA;
    --surface: #FFFFFF;
    --surface-2: #F1F3F9;
    --surface-hover: #E9ECF5;
    --text: #191B26;
    --text-soft: #656B80;
    --text-faint: #9096A8;
    --accent: #4F46E5;
    --accent-hover: #4338CA;
    --accent-soft: #EEF0FF;
    --accent-contrast: #FFFFFF;
    --border: #E3E6EF;
    --border-strong: #CBD0E0;
    --success: #16A34A;
    --success-soft: #E8F8EE;
    --danger: #DC2626;
    --danger-soft: #FDECEC;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px rgba(16,24,40,0.06);
    --shadow-md: 0 4px 16px rgba(16,24,40,0.08);
    --shadow-lg: 0 16px 40px rgba(16,24,40,0.14);
    --content-width: 1180px;
  }
  html[data-theme="dark"]{
    --bg: #0E0F14;
    --surface: #171921;
    --surface-2: #1E212B;
    --surface-hover: #262A37;
    --text: #EDEEF3;
    --text-soft: #9BA0B4;
    --text-faint: #6D7288;
    --accent: #6D66F0;
    --accent-hover: #8781FF;
    --accent-soft: rgba(109,102,240,0.16);
    --accent-contrast: #FFFFFF;
    --border: #262A37;
    --border-strong: #343A4A;
    --success: #34D399;
    --success-soft: rgba(52,211,153,0.12);
    --danger: #F87171;
    --danger-soft: rgba(248,113,113,0.12);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.35);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
    --shadow-lg: 0 16px 40px rgba(0,0,0,0.55);
  }

  *{box-sizing:border-box;}
  html{ background:var(--bg); scroll-behavior:smooth; }
  body{
    margin:0;
    background:var(--bg);
    font-family:'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color:var(--text);
    min-height:100vh;
    transition:background-color .2s ease, color .2s ease;
  }
  a{ color:var(--accent); }

  button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible, [tabindex]:focus-visible{
    outline:none; box-shadow:0 0 0 3px var(--accent-soft), 0 0 0 1px var(--accent); border-radius:6px;
  }

  /* ---------- Header ---------- */
  .site-header{
    position:sticky; top:0; z-index:70; background:color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter:blur(10px); -webkit-backdrop-filter:blur(10px);
    border-bottom:1px solid var(--border);
  }
  .header-inner{
    max-width:var(--content-width); margin:0 auto; padding:16px 20px;
    display:flex; align-items:center; justify-content:space-between; gap:16px;
  }
  .brand{ display:flex; align-items:center; gap:10px; text-decoration:none; color:var(--text); }
  .brand-icon{ width:30px; height:30px; flex-shrink:0; }
  .brand-name{ font-weight:800; font-size:18px; letter-spacing:-0.01em; color:var(--text); }
  .site-nav{ display:flex; align-items:center; gap:4px; }
  .nav-link{
    font-family:inherit; font-size:14px; font-weight:600; color:var(--text-soft); text-decoration:none;
    background:none; border:none; cursor:pointer;
    padding:8px 12px; border-radius:var(--radius-sm); transition:background-color .15s, color .15s;
  }
  .nav-link:hover{ background:var(--surface-hover); color:var(--text); }
  .theme-toggle{
    display:inline-flex; align-items:center; gap:6px;
    font-family:inherit; font-size:13px; font-weight:600; color:var(--text-soft);
    background:var(--surface); border:1px solid var(--border); margin-left:6px;
    padding:8px 14px; border-radius:999px; cursor:pointer; transition:background-color .15s, color .15s, border-color .15s, box-shadow .15s;
  }
  .theme-toggle:hover{ color:var(--text); border-color:var(--border-strong); box-shadow:var(--shadow-sm); }

  main.page-content{ max-width:var(--content-width); margin:0 auto; padding:44px 20px 90px; }

  /* ---------- Hero ---------- */
  .kicker{
    font-family:'JetBrains Mono', monospace; font-size:12px; letter-spacing:0.12em; font-weight:600;
    text-transform:uppercase; color:var(--accent); display:flex; align-items:center; gap:8px; margin-bottom:12px;
  }
  h1{
    font-weight:800; font-size:40px; line-height:1.1; letter-spacing:-0.02em; margin:0 0 12px; color:var(--text);
  }
  .sub{ color:var(--text-soft); font-size:17px; margin:0 0 32px; max-width:60ch; line-height:1.6; }

  /* ---------- Privacy card ---------- */
  .privacy-card{
    display:flex; gap:14px; align-items:flex-start; background:var(--accent-soft);
    border:1px solid var(--accent); border-radius:var(--radius-lg); padding:18px 20px; margin-bottom:36px;
  }
  .privacy-card svg{ flex-shrink:0; width:22px; height:22px; color:var(--accent); margin-top:2px; }
  .privacy-card h3{ margin:0 0 4px; font-size:15px; font-weight:700; color:var(--text); }
  .privacy-card p{ margin:0; font-size:14px; color:var(--text-soft); line-height:1.55; }

  /* ---------- Navegación de herramientas (inicio en grid + categorías) ---------- */
  .tool-quicknav{ display:flex; gap:8px; flex-wrap:wrap; margin-bottom:30px; }
  .tool-quicknav a{
    font-family:inherit; font-size:13.5px; font-weight:700; color:var(--text-soft); text-decoration:none;
    background:var(--surface); border:1px solid var(--border); padding:9px 16px; border-radius:999px;
    transition:background-color .15s, color .15s, border-color .15s, box-shadow .15s;
  }
  .tool-quicknav a:hover{ background:var(--surface-hover); color:var(--text); border-color:var(--border-strong); box-shadow:var(--shadow-sm); }

  .tool-cat{ margin-bottom:36px; scroll-margin-top:20px; }
  .tool-cat:last-child{ margin-bottom:0; }
  .tool-cat-title{
    font-size:13px; font-weight:700; text-transform:uppercase; letter-spacing:0.08em;
    color:var(--text-faint); margin:0 0 14px;
  }
  .tool-grid{ display:grid; grid-template-columns:repeat(auto-fill, minmax(210px, 1fr)); gap:14px; }
  .tool-card{
    display:flex; flex-direction:column; align-items:flex-start; gap:10px; text-align:left;
    background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-lg);
    padding:20px; cursor:pointer; box-shadow:var(--shadow-sm); font-family:inherit; width:100%;
    transition:border-color .15s, box-shadow .15s, transform .15s;
  }
  .tool-card:hover{ border-color:var(--accent); box-shadow:var(--shadow-md); transform:translateY(-2px); }
  .tool-card:active{ transform:translateY(0); }
  .tool-card-icon{
    width:42px; height:42px; border-radius:var(--radius-md); background:var(--accent-soft); color:var(--accent);
    display:flex; align-items:center; justify-content:center; flex-shrink:0;
  }
  .tool-card-icon svg{ width:22px; height:22px; }
  .tool-card-name{ font-size:15px; font-weight:700; color:var(--text); }
  .tool-card-desc{ font-size:13px; color:var(--text-soft); line-height:1.5; }

  .tool-back-btn{
    display:inline-flex; align-items:center; gap:6px; font-family:inherit; font-size:13.5px; font-weight:700;
    color:var(--text-soft); background:none; border:none; cursor:pointer; padding:0; margin-bottom:22px;
    transition:color .15s;
  }
  .tool-back-btn:hover{ color:var(--accent); }
  .tool-back-btn svg{ width:15px; height:15px; }

  .panel-wrap{
    background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-lg);
    box-shadow:var(--shadow-md); padding:32px 30px 34px;
  }
  .panel{ display:none; opacity:0; transform:translateY(6px); }
  .panel.active{ display:block; animation:panelIn .28s ease forwards; }
  @keyframes panelIn{ from{ opacity:0; transform:translateY(6px); } to{ opacity:1; transform:translateY(0); } }

  .dropzone{
    border:2px dashed var(--border-strong); border-radius:var(--radius-lg); background:var(--surface-2);
    padding:40px 20px; text-align:center; cursor:pointer;
    transition:border-color .15s, background-color .15s, transform .15s, box-shadow .15s;
  }
  .dropzone:hover{ border-color:var(--accent); box-shadow:var(--shadow-sm); }
  .dropzone.drag{ border-color:var(--accent); background:var(--accent-soft); transform:scale(1.01); }
  .dropzone .dz-title{ font-size:15px; font-weight:700; color:var(--text); margin-bottom:4px; }
  .dropzone .dz-sub{ font-size:13.5px; color:var(--text-soft); }
  input[type=file]{display:none;}

  .stack{ margin-top:22px; display:flex; flex-direction:column; gap:10px; }
  .empty-hint{ font-size:14px; color:var(--text-faint); text-align:center; padding:14px 0 0; }
  .file-row{
    display:flex; align-items:center; gap:14px; background:var(--surface); border:1px solid var(--border);
    border-radius:var(--radius-md); padding:12px 14px; box-shadow:var(--shadow-sm); cursor:grab; position:relative;
    transition:box-shadow .15s, transform .15s, border-color .15s;
  }
  .file-row:hover{ box-shadow:var(--shadow-md); transform:translateY(-1px); }
  .file-row.dragging{ opacity:0.4; }
  .file-row.over{ border-color:var(--accent); box-shadow:0 0 0 2px var(--accent-soft); }
  .idx{
    font-size:13px; font-weight:700; color:var(--accent-contrast);
    background:var(--accent); width:26px;height:26px; border-radius:50%; display:flex;align-items:center;justify-content:center; flex-shrink:0;
  }
  .file-icon{ width:30px;height:36px; border:1.6px solid var(--text-faint); border-radius:3px; flex-shrink:0; position:relative; background:var(--surface-2); }
  .file-icon::before{
    content:""; position:absolute; top:6px; left:5px; right:5px;
    border-top:1.4px solid var(--text-faint); box-shadow:0 5px 0 var(--text-faint), 0 10px 0 var(--text-faint);
  }
  .file-meta{ flex:1; min-width:0; }
  .file-name{ font-size:14.5px; font-weight:600; color:var(--text); white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
  .file-sub{ font-size:12px; color:var(--text-faint); margin-top:2px; }
  .grip{ color:var(--text-faint); font-size:16px; letter-spacing:2px; cursor:grab; user-select:none; padding:0 2px; flex-shrink:0; }
  .rm-btn{
    background:none; border:1px solid var(--border); color:var(--text-soft);
    font-family:inherit; font-size:12.5px; font-weight:600; padding:7px 11px; border-radius:var(--radius-sm); cursor:pointer; flex-shrink:0;
    transition:border-color .15s, color .15s, background-color .15s;
  }
  .rm-btn:hover{ border-color:var(--danger); color:var(--danger); background:var(--danger-soft); }

  .actions{ margin-top:28px; display:flex; align-items:center; gap:18px; flex-wrap:wrap; }
  .stamp-btn{
    font-family:inherit; font-size:15px; font-weight:700; color:var(--accent-contrast);
    background:var(--accent); border:none; border-radius:var(--radius-md); padding:13px 26px; cursor:pointer;
    box-shadow:var(--shadow-sm); transition:background-color .15s, box-shadow .15s, transform .12s;
  }
  .stamp-btn:hover:not(:disabled){ background:var(--accent-hover); box-shadow:var(--shadow-md); transform:translateY(-1px); }
  .stamp-btn:active:not(:disabled){ transform:translateY(0); }
  .stamp-btn:disabled{ opacity:0.4; cursor:not-allowed; box-shadow:none; transform:none; }
  .clear-btn{
    background:none; border:none; font-family:inherit; font-size:13px; font-weight:600;
    color:var(--text-soft); text-decoration:underline; cursor:pointer; padding:0; transition:color .15s;
  }
  .clear-btn:hover{ color:var(--accent); }
  .status{ font-size:13px; color:var(--text-soft); }
  .status.err{ color:var(--danger); font-weight:600; }
  .status.ok{ color:var(--success); font-weight:600; }

  .result{
    margin-top:26px; padding:18px 20px; background:var(--success-soft); border:1px solid var(--success);
    border-radius:var(--radius-md); display:none; align-items:center;
    justify-content:space-between; gap:16px; flex-wrap:wrap;
  }
  .result.show{ display:flex; animation:resultIn .3s ease; }
  @keyframes resultIn{ from{ opacity:0; transform:translateY(4px); } to{ opacity:1; transform:translateY(0); } }
  .result-check{ width:26px; height:26px; flex-shrink:0; animation:checkPop .35s ease; }
  @keyframes checkPop{ 0%{ transform:scale(0); opacity:0; } 60%{ transform:scale(1.15); opacity:1; } 100%{ transform:scale(1); } }
  .result-row{ display:flex; align-items:center; gap:12px; }
  .result-text{ font-size:14.5px; font-weight:700; color:var(--text); }
  .result-sub{ font-size:12.5px; color:var(--text-soft); margin-top:3px;}
  .dl-row{ display:flex; gap:10px; flex-wrap:wrap; }
  .dl-link{
    font-family:inherit; font-size:13.5px; font-weight:700;
    color:var(--accent-contrast); background:var(--accent); padding:10px 18px; border-radius:var(--radius-sm);
    text-decoration:none; white-space:nowrap; transition:background-color .15s, box-shadow .15s, transform .12s;
  }
  .dl-link:hover{ background:var(--accent-hover); box-shadow:var(--shadow-sm); transform:translateY(-1px); }
  .dl-link.secondary{ background:var(--surface); color:var(--text); border:1px solid var(--border-strong); }
  .dl-link.secondary:hover{ border-color:var(--accent); color:var(--accent); background:var(--surface); }

  .mode-row{ display:flex; gap:22px; margin:24px 0 4px; flex-wrap:wrap; }
  .mode-opt{ font-size:13.5px; font-weight:600; color:var(--text); display:flex; align-items:center; gap:8px; cursor:pointer; }
  .mode-opt input{ accent-color:var(--accent); width:16px; height:16px; }
  .range-field{ margin-top:16px; }
  .range-field label{
    display:block; font-size:12px; font-weight:700; text-transform:uppercase;
    letter-spacing:0.05em; color:var(--text-soft); margin-bottom:6px;
  }
  .range-field input[type=text], select.field{
    width:100%; font-family:inherit; font-size:14px; background:var(--surface-2); color:var(--text);
    border:1px solid var(--border-strong); border-radius:var(--radius-sm); padding:11px 13px;
    transition:border-color .15s, box-shadow .15s;
  }
  .range-field input[type=text]:focus, select.field:focus{ border-color:var(--accent); }
  .range-hint{ font-size:12.5px; color:var(--text-faint); margin-top:8px; }
  .source-info{ display:flex; align-items:center; gap:14px; margin-top:24px; background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md); padding:13px 15px; box-shadow:var(--shadow-sm); }

  .lang-field{ margin-top:22px; max-width:280px; }
  .lang-field label{
    display:block; font-size:12px; font-weight:700; text-transform:uppercase;
    letter-spacing:0.05em; color:var(--text-soft); margin-bottom:6px;
  }

  .progress-wrap{ margin-top:22px; display:none; }
  .progress-wrap.show{ display:block; }
  .progress-label{ font-size:12.5px; font-weight:600; color:var(--text-soft); margin-bottom:7px; display:flex; justify-content:space-between; }
  .progress-track{ height:8px; background:var(--surface-2); border-radius:999px; overflow:hidden; }
  .progress-fill{
    height:100%; width:0%; border-radius:999px;
    background:linear-gradient(90deg, var(--accent), var(--accent-hover), var(--accent));
    background-size:200% 100%; animation:shimmer 1.4s linear infinite;
    transition:width .25s ease;
  }
  @keyframes shimmer{ 0%{ background-position:0% 0; } 100%{ background-position:-200% 0; } }

  .info-note{
    margin-top:20px; font-size:13px; color:var(--text-soft); line-height:1.55;
    background:var(--surface-2); border-left:3px solid var(--accent); border-radius:var(--radius-sm); padding:13px 15px;
  }

  .ai-box{
    margin-top:24px; background:var(--surface-2); border:1px solid var(--border); border-radius:var(--radius-md); padding:16px 18px;
  }
  .ai-box-title{ font-size:13.5px; font-weight:700; color:var(--text); }
  .ai-box input[type=password], .ai-box input[type=text]{
    width:100%; font-family:inherit; font-size:13.5px; background:var(--surface); color:var(--text);
    border:1px solid var(--border-strong); border-radius:var(--radius-sm); padding:10px 12px;
    transition:border-color .15s;
  }
  .ai-box input[type=password]:focus, .ai-box input[type=text]:focus{ border-color:var(--accent); }
  .ai-box-hint{ font-size:12.5px; color:var(--text-soft); margin-top:9px; line-height:1.55; }

  .fatal-banner{
    display:none; max-width:var(--content-width); margin:16px auto 0; background:var(--danger-soft); border:1px solid var(--danger);
    border-radius:var(--radius-md); padding:14px 18px; font-size:13.5px; color:var(--danger);
    line-height:1.5;
  }
  .fatal-banner.show{ display:block; }

  /* ---------- Privacy modal ---------- */
  .pv-screen{
    display:none; position:fixed; inset:0; z-index:200; background:rgba(10,11,16,0.55);
    padding:24px 16px; align-items:flex-start; justify-content:center; overflow-y:auto;
    -webkit-backdrop-filter:blur(2px); backdrop-filter:blur(2px);
  }
  .pv-screen.show{ display:flex; animation:overlayIn .18s ease; }
  @keyframes overlayIn{ from{ opacity:0; } to{ opacity:1; } }
  .pv-panel{
    background:var(--surface); color:var(--text); border:1px solid var(--border); border-radius:var(--radius-lg);
    box-shadow:var(--shadow-lg); max-width:680px; width:100%; margin:24px 0; padding:32px 30px 34px; position:relative;
    animation:modalIn .22s ease;
  }
  @keyframes modalIn{ from{ opacity:0; transform:translateY(10px) scale(0.98); } to{ opacity:1; transform:translateY(0) scale(1); } }
  .pv-panel h2{ font-size:24px; font-weight:800; margin:0 0 6px; letter-spacing:-0.01em; }
  .pv-panel .privacy-updated{ font-size:12.5px; color:var(--text-faint); margin:0 0 24px; }
  .pv-panel h3{ font-size:15px; font-weight:700; margin:26px 0 8px; color:var(--text); }
  .pv-panel h3:first-of-type{ margin-top:22px; }
  .pv-panel p{ font-size:14px; line-height:1.65; color:var(--text-soft); margin:0 0 10px; }
  .pv-panel ul{ margin:0 0 10px; padding-left:20px; }
  .pv-panel li{ font-size:14px; line-height:1.65; color:var(--text-soft); margin-bottom:6px; }
  .pv-panel a{ color:var(--accent); font-weight:600; }
  .pv-summary{
    display:flex; gap:12px; align-items:flex-start; background:var(--accent-soft); border:1px solid var(--accent);
    border-radius:var(--radius-md); padding:14px 16px; margin-bottom:8px;
  }
  .pv-summary svg{ flex-shrink:0; width:20px; height:20px; color:var(--accent); margin-top:1px; }
  .pv-summary p{ margin:0; font-size:13.5px; color:var(--text); line-height:1.55; }
  .pv-close{
    position:absolute; top:18px; right:18px; width:34px; height:34px; border-radius:50%;
    background:var(--surface-2); border:1px solid var(--border); color:var(--text-soft); cursor:pointer;
    display:flex; align-items:center; justify-content:center; transition:background-color .15s, color .15s, border-color .15s;
  }
  .pv-close:hover{ background:var(--surface-hover); color:var(--text); border-color:var(--border-strong); }
  .pv-close svg{ width:16px; height:16px; }
  @media (max-width: 640px){
    .pv-panel{ padding:26px 20px 28px; }
  }

  /* ---------- Campos de texto genéricos ---------- */
  .field-input{
    width:100%; font-family:inherit; font-size:14px; background:var(--surface-2); color:var(--text);
    border:1px solid var(--border-strong); border-radius:var(--radius-sm); padding:11px 13px;
    transition:border-color .15s, box-shadow .15s;
  }
  .field-input:focus{ border-color:var(--accent); }
  textarea.field-input{ resize:vertical; line-height:1.55; font-family:inherit; }

  /* ---------- Citas bibliográficas ---------- */
  .cite-grid{ display:grid; grid-template-columns:1fr 1fr; gap:16px 20px; margin-top:20px; }
  .cite-grid .lang-field{ margin:0; max-width:none; }
  .cite-grid .lang-field.full{ grid-column:1 / -1; }
  @media (max-width:640px){ .cite-grid{ grid-template-columns:1fr; } }
  .cite-hint{ font-size:12px; color:var(--text-faint); margin-top:5px; }
  .cite-results{ margin-top:28px; display:flex; flex-direction:column; gap:14px; }
  .cite-card{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md); padding:16px 18px; box-shadow:var(--shadow-sm); }
  .cite-card-head{ display:flex; align-items:center; justify-content:space-between; gap:10px; margin-bottom:10px; }
  .cite-card-title{ font-size:12px; font-weight:700; text-transform:uppercase; letter-spacing:.05em; color:var(--accent); }
  .cite-card-text{ font-size:14.5px; line-height:1.65; color:var(--text); padding-left:24px; text-indent:-24px; }
  .cite-empty{ margin-top:20px; font-size:13.5px; color:var(--text-faint); }

  /* ---------- Contador de palabras ---------- */
  .wc-textarea{ min-height:260px; font-size:14.5px; }
  .wc-stats{ display:grid; grid-template-columns:repeat(auto-fit, minmax(130px,1fr)); gap:12px; margin-top:20px; }
  .wc-stat{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md); padding:14px 12px; text-align:center; box-shadow:var(--shadow-sm); }
  .wc-stat-value{ font-size:23px; font-weight:800; color:var(--text); letter-spacing:-0.02em; }
  .wc-stat-label{ font-size:11px; font-weight:700; text-transform:uppercase; letter-spacing:.04em; color:var(--text-soft); margin-top:4px; }

  /* ---------- Compresor de imágenes ---------- */
  .img-opts-row{ display:flex; gap:24px; flex-wrap:wrap; margin-top:20px; }
  .img-result-row{ display:flex; align-items:center; gap:14px; padding:11px 0; border-bottom:1px solid var(--border); }
  .img-result-row:last-child{ border-bottom:none; }
  .img-result-name{ font-size:13.5px; font-weight:600; color:var(--text); overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
  .img-result-meta{ font-size:12.5px; color:var(--text-soft); margin-top:2px; }
  .img-result-meta .win{ color:var(--success); font-weight:700; }
  .img-result-actions{ margin-left:auto; flex-shrink:0; }

  /* ---------- Generador de QR ---------- */
  .qr-preview-wrap{ margin-top:24px; display:flex; flex-direction:column; align-items:center; gap:16px; padding:28px; background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md); box-shadow:var(--shadow-sm); }
  .qr-preview-box{ background:#fff; padding:16px; border-radius:var(--radius-sm); line-height:0; }
  .qr-preview-box img, .qr-preview-box canvas{ display:block; }
  .qr-empty{ color:var(--text-faint); font-size:13.5px; }

  /* ---------- Generador de CV ---------- */
  .cv-section-title{ font-size:13px; font-weight:700; text-transform:uppercase; letter-spacing:.05em; color:var(--accent); margin:26px 0 4px; }
  .cv-section-title:first-child{ margin-top:0; }
  .cv-preview-wrap{ margin-top:24px; display:flex; flex-direction:column; align-items:center; gap:16px; }
  .cv-preview-img{ max-width:100%; border:1px solid var(--border); border-radius:var(--radius-sm); box-shadow:var(--shadow-md); }

  /* ---------- Generador de contraseñas ---------- */
  .pw-output-row{ display:flex; gap:10px; align-items:stretch; }
  .pw-output{ flex:1; font-family:'SF Mono', Consolas, Menlo, monospace; font-size:19px; letter-spacing:0.02em; padding:14px 16px; }
  .pw-check-grid{ display:grid; grid-template-columns:repeat(auto-fit,minmax(180px,1fr)); gap:10px 20px; margin-top:18px; }
  .pw-check-grid label{ font-size:13.5px; font-weight:600; color:var(--text); display:flex; align-items:center; gap:8px; cursor:pointer; }
  .pw-check-grid input{ accent-color:var(--accent); width:16px; height:16px; }
  .pw-strength{ margin-top:16px; }
  .pw-strength-track{ height:7px; background:var(--surface-2); border-radius:999px; overflow:hidden; }
  .pw-strength-fill{ height:100%; border-radius:999px; transition:width .2s ease, background-color .2s ease; }
  .pw-strength-label{ font-size:12.5px; font-weight:700; color:var(--text-soft); margin-top:6px; }

  /* ---------- Temporizador Pomodoro ---------- */
  .pomo-wrap{ display:flex; flex-direction:column; align-items:center; gap:10px; padding:36px 20px; background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-lg); box-shadow:var(--shadow-sm); }
  .pomo-phase{ font-size:12.5px; font-weight:700; text-transform:uppercase; letter-spacing:.08em; color:var(--accent); }
  .pomo-time{ font-size:64px; font-weight:800; letter-spacing:-0.02em; color:var(--text); font-variant-numeric:tabular-nums; }
  .pomo-round{ font-size:13px; color:var(--text-soft); }
  .pomo-controls{ display:flex; gap:12px; margin-top:14px; flex-wrap:wrap; justify-content:center; }
  .pomo-settings{ display:grid; grid-template-columns:repeat(auto-fit,minmax(150px,1fr)); gap:14px 20px; margin-top:26px; }
  .pomo-settings .lang-field{ margin:0; max-width:none; }

  /* ---------- Calculadora de porcentajes ---------- */
  .pct-card{ background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md); padding:18px 20px; box-shadow:var(--shadow-sm); margin-top:18px; }
  .pct-card:first-child{ margin-top:0; }
  .pct-card-title{ font-size:14px; font-weight:700; color:var(--text); margin-bottom:14px; }
  .pct-row{ display:flex; align-items:center; gap:10px; flex-wrap:wrap; font-size:14.5px; color:var(--text-soft); }
  .pct-row input{ width:110px; font-family:inherit; font-size:14.5px; font-weight:700; color:var(--text); background:var(--surface-2); border:1px solid var(--border-strong); border-radius:var(--radius-sm); padding:9px 11px; text-align:center; }
  .pct-row input:focus{ border-color:var(--accent); }
  .pct-result{ margin-top:12px; font-size:20px; font-weight:800; color:var(--accent); }
  .pct-result .neg{ color:var(--danger); }

  /* ---------- Índice / TOC ---------- */
  .toc-list-header{ display:flex; align-items:center; justify-content:space-between; gap:12px; flex-wrap:wrap; margin-top:22px; margin-bottom:14px; }
  .toc-list-header h3{ margin:0; font-size:15px; font-weight:700; color:var(--text); }
  .toc-layout{ display:grid; grid-template-columns:1fr 260px; gap:22px; align-items:start; }
  @media (max-width:760px){ .toc-layout{ grid-template-columns:1fr; } }
  .toc-list{ display:flex; flex-direction:column; gap:8px; max-height:480px; overflow-y:auto; padding-right:4px; }
  .toc-item{
    display:flex; align-items:center; gap:10px; background:var(--surface); border:1px solid var(--border);
    border-radius:var(--radius-md); padding:10px 12px; box-shadow:var(--shadow-sm);
  }
  .toc-item.active{ border-color:var(--accent); box-shadow:0 0 0 2px var(--accent-soft); }
  .toc-item-page{
    flex:0 0 auto; font-family:'JetBrains Mono', monospace; font-size:11px; font-weight:700; color:var(--accent);
    background:var(--accent-soft); border-radius:999px; padding:4px 9px; white-space:nowrap;
  }
  .toc-item-title{ flex:1; min-width:0; font-size:13.5px; font-weight:600; color:var(--text); overflow:hidden; text-overflow:ellipsis; white-space:nowrap; cursor:pointer; }
  .toc-item-title:hover{ color:var(--accent); }
  .toc-item-dl{
    flex:0 0 auto; font-family:inherit; font-size:12px; font-weight:700; color:var(--text-soft);
    background:var(--surface-2); border:1px solid var(--border); border-radius:var(--radius-sm);
    padding:6px 10px; cursor:pointer; transition:border-color .15s, color .15s;
  }
  .toc-item-dl:hover{ border-color:var(--accent); color:var(--accent); }
  .toc-preview-wrap{ position:sticky; top:90px; }
  .toc-preview-label{ font-size:12px; font-weight:700; color:var(--text-soft); margin-bottom:8px; }
  .toc-preview-canvas-wrap{
    border:1px solid var(--border); border-radius:var(--radius-md); background:var(--surface-2);
    overflow:auto; max-height:480px; display:flex; align-items:flex-start; justify-content:center; padding:8px;
  }
  .toc-preview-canvas-wrap canvas{ max-width:100%; height:auto; box-shadow:var(--shadow-sm); }

  /* ---------- Calendario de estudio ---------- */
  .sched-editor-header{ display:flex; align-items:center; justify-content:space-between; gap:12px; flex-wrap:wrap; }
  .sched-name-input{ max-width:280px; font-weight:700; }

  .sched-subjects-wrap{ margin-top:20px; }
  .sched-subjects-list{ display:flex; flex-wrap:wrap; gap:8px; margin-bottom:12px; }
  .sched-subject-chip{
    display:inline-flex; align-items:center; gap:7px; background:var(--surface); border:1.5px solid var(--border);
    border-radius:999px; padding:6px 8px 6px 10px; cursor:pointer; font-size:13px; font-weight:600; color:var(--text);
    transition:border-color .15s, box-shadow .15s;
  }
  .sched-subject-chip.selected{ border-color:var(--text); box-shadow:0 0 0 2px var(--accent-soft); }
  .sched-subject-dot{ width:11px; height:11px; border-radius:50%; flex-shrink:0; }
  .sched-subject-rm{ background:none; border:none; color:var(--text-faint); cursor:pointer; font-size:12px; padding:0 2px; }
  .sched-subject-rm:hover{ color:var(--danger); }
  .sched-add-subject-row{ display:flex; align-items:center; gap:10px; flex-wrap:wrap; }
  .sched-add-subject-row .field-input{ max-width:220px; width:auto; flex:1; min-width:160px; }
  .sched-color-swatches{ display:flex; align-items:center; gap:6px; }
  .sched-color-swatch{ width:22px; height:22px; border-radius:50%; border:2px solid transparent; cursor:pointer; padding:0; flex-shrink:0; }
  .sched-color-swatch.selected{ border-color:var(--text); }
  input[type=color].sched-color-swatch{ border:2px solid var(--border-strong); background:none; overflow:hidden; }
  input[type=color].sched-color-swatch::-webkit-color-swatch-wrapper{ padding:0; }
  input[type=color].sched-color-swatch::-webkit-color-swatch{ border:none; border-radius:50%; }

  .sched-summary{ display:flex; flex-wrap:wrap; gap:10px; margin:18px 0; }
  .sched-summary-chip{
    display:inline-flex; align-items:center; gap:7px; background:var(--surface-2); border:1px solid var(--border);
    border-radius:var(--radius-sm); padding:6px 12px; font-size:12.5px; font-weight:600; color:var(--text);
  }

  .sched-grid-scroll{ overflow-x:auto; -webkit-overflow-scrolling:touch; border:1px solid var(--border); border-radius:var(--radius-lg); margin-top:18px; }
  .sched-grid{ min-width:720px; user-select:none; }
  .sched-grid-header{ display:grid; grid-template-columns:56px repeat(7, 1fr); background:var(--surface-2); border-bottom:1px solid var(--border); }
  .sched-grid-header > div{ padding:10px 6px; text-align:center; font-size:11.5px; font-weight:700; text-transform:uppercase; letter-spacing:0.04em; color:var(--text-soft); }
  .sched-grid-body{ display:grid; grid-template-columns:56px repeat(7, 1fr); position:relative; }
  .sched-time-col{ position:relative; border-right:1px solid var(--border); }
  .sched-time-label{ position:absolute; left:0; right:6px; text-align:right; font-size:10px; color:var(--text-faint); transform:translateY(-50%); white-space:nowrap; }
  .sched-day-col{
    position:relative; border-right:1px solid var(--border); cursor:crosshair;
    background-image:repeating-linear-gradient(to bottom, var(--border) 0, var(--border) 1px, transparent 1px, transparent calc(var(--row-h) * 2));
  }
  .sched-day-col:last-child{ border-right:none; }
  .sched-block{
    position:absolute; left:2px; right:2px; border-radius:6px; padding:3px 6px; overflow:hidden;
    font-size:10.5px; font-weight:700; color:#fff; cursor:grab; box-shadow:var(--shadow-sm); line-height:1.25;
    border:1.5px solid rgba(255,255,255,0.35); touch-action:none;
  }
  .sched-block.selected{ outline:2px solid var(--text); outline-offset:1px; }
  .sched-block.dragging{ opacity:0.85; z-index:5; }
  .sched-block-label{ display:block; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
  .sched-block-label small{ font-weight:600; opacity:0.85; font-size:9px; }
  .sched-block-rm{
    position:absolute; top:2px; right:2px; width:16px; height:16px; border-radius:50%; border:none;
    background:rgba(0,0,0,0.28); color:#fff; font-size:10px; line-height:16px; text-align:center; padding:0; cursor:pointer; display:none;
  }
  .sched-block.selected .sched-block-rm{ display:block; }
  .sched-block-resize{ position:absolute; left:0; right:0; bottom:0; height:8px; cursor:ns-resize; }

  .sched-export-styles{ display:flex; gap:10px; flex-wrap:wrap; margin:18px 0; }
  .sched-style-btn{
    font-family:inherit; font-size:13px; font-weight:600; color:var(--text-soft); background:var(--surface);
    border:1.5px solid var(--border); border-radius:999px; padding:8px 16px; cursor:pointer; transition:border-color .15s, color .15s, background-color .15s;
  }
  .sched-style-btn:hover{ border-color:var(--border-strong); color:var(--text); }
  .sched-style-btn.active{ background:var(--accent); border-color:var(--accent); color:var(--accent-contrast); }
  .sched-export-preview-wrap{ background:var(--surface-2); border:1px solid var(--border); border-radius:var(--radius-md); padding:14px; overflow:auto; text-align:center; }
  .sched-export-preview-wrap canvas{ max-width:100%; height:auto; border-radius:4px; box-shadow:var(--shadow-sm); }

  /* ---------- Flashcards: mazos ---------- */
  .flash-decks-wrap{ margin-top:4px; }
  .flash-decks-header{ display:flex; align-items:center; justify-content:space-between; gap:12px; margin-bottom:14px; flex-wrap:wrap; }
  .flash-decks-header h3{ margin:0; font-size:15px; font-weight:700; color:var(--text); }
  .flash-decks-list{ display:flex; flex-direction:column; gap:10px; }
  .flash-deck-item{
    display:flex; align-items:center; justify-content:space-between; gap:14px; flex-wrap:wrap;
    background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md);
    padding:14px 16px; box-shadow:var(--shadow-sm);
  }
  .flash-deck-item-name{ font-size:14.5px; font-weight:700; color:var(--text); }
  .flash-deck-item-sub{ font-size:12px; color:var(--text-faint); margin-top:2px; }
  .flash-deck-item-actions{ display:flex; gap:8px; flex-wrap:wrap; }

  /* ---------- Flashcards: editor ---------- */
  .flash-editor{ margin-top:24px; padding-top:24px; border-top:1px solid var(--border); }

  /* ---------- Flashcards: repaso ---------- */
  .flashcards-stage{ margin-top:8px; display:flex; flex-direction:column; align-items:center; gap:16px; }
  .flash-stage-header{ width:100%; max-width:440px; display:flex; align-items:center; justify-content:space-between; gap:10px; flex-wrap:wrap; }
  .flash-deck-title{ font-size:15px; font-weight:700; color:var(--text); }
  .flash-actions-row{ display:flex; gap:8px; flex-wrap:wrap; }
  .flash-progress-wrap{ width:100%; max-width:440px; }
  .flash-progress-label{ font-size:12.5px; font-weight:600; color:var(--text-soft); margin-bottom:6px; text-align:center; }
  .flash-progress-wrap .progress-fill{ animation:none; background:var(--accent); }
  .flashcard{ width:100%; max-width:440px; height:230px; perspective:1400px; cursor:pointer; touch-action:pan-y; user-select:none; }
  .flashcard-inner{
    position:relative; width:100%; height:100%; transition:transform .5s cubic-bezier(.4,.2,.2,1); transform-style:preserve-3d;
  }
  .flashcard.flipped .flashcard-inner{ transform:rotateY(180deg); }
  .flashcard.dragging .flashcard-inner{ transition:none; }
  .flashcard-face{
    position:absolute; inset:0; backface-visibility:hidden; -webkit-backface-visibility:hidden;
    border-radius:var(--radius-lg); border:1px solid var(--border); box-shadow:var(--shadow-md);
    display:flex; align-items:center; justify-content:center; text-align:center; padding:28px;
    font-size:18px; font-weight:700; color:var(--text); background:var(--surface); overflow:auto;
  }
  .flashcard-back{ transform:rotateY(180deg); background:var(--accent-soft); border-color:var(--accent); font-weight:600; font-size:15.5px; }
  .flash-assess-row{ display:flex; gap:14px; width:100%; max-width:440px; }
  .flash-assess-row button{ flex:1; }
  .flash-no-btn{ border-color:var(--danger); color:var(--danger); }
  .flash-no-btn:hover{ background:var(--danger-soft); border-color:var(--danger); color:var(--danger); }
  .flash-yes-btn{ background:var(--success); }
  .flash-yes-btn:hover{ background:var(--success); opacity:0.9; }
  .flash-controls{ display:flex; gap:14px; align-items:center; }
  .flash-done-box{
    width:100%; max-width:440px; text-align:center; background:var(--success-soft); border:1px solid var(--success);
    border-radius:var(--radius-md); padding:22px 18px;
  }

  /* ---------- Buscador de ISBN ---------- */
  .isbn-result{
    margin-top:26px; display:none; gap:18px; background:var(--surface-2); border:1px solid var(--border);
    border-radius:var(--radius-md); padding:18px; align-items:flex-start;
  }
  .isbn-result.show{ display:flex; }
  .isbn-cover{
    width:88px; height:128px; flex-shrink:0; border-radius:var(--radius-sm); background:var(--surface);
    border:1px solid var(--border); display:flex; align-items:center; justify-content:center; overflow:hidden;
    font-size:11px; color:var(--text-faint); text-align:center; padding:6px;
  }
  .isbn-cover img{ width:100%; height:100%; object-fit:cover; }
  .isbn-meta{ flex:1; min-width:0; }
  .isbn-title{ font-size:16.5px; font-weight:800; color:var(--text); margin-bottom:6px; line-height:1.3; }
  .isbn-sub{ font-size:13.5px; color:var(--text-soft); margin-bottom:4px; }
  .isbn-cite{
    margin-top:10px; font-size:12.5px; color:var(--text-soft); background:var(--surface); border:1px solid var(--border);
    border-radius:var(--radius-sm); padding:10px 12px; font-style:italic; line-height:1.5;
  }

  /* ---------- Enlaces a otras herramientas (páginas SEO por herramienta) ---------- */
  .related-tools{ margin-top:40px; padding-top:28px; border-top:1px solid var(--border); }
  .related-tools h2{ font-size:15px; font-weight:700; color:var(--text); margin:0 0 12px; }
  .related-tools ul{ list-style:none; margin:0 0 14px; padding:0; display:flex; flex-direction:column; gap:8px; }
  .related-tools a{ color:var(--accent); font-weight:600; font-size:14px; text-decoration:none; }
  .related-tools a:hover{ text-decoration:underline; }
  .related-tools > p{ margin:0; }
  .related-tools > p a{ font-weight:700; }

  .ad-slot{ margin-top:44px; }
  .ad-label{
    display:block; font-family:'JetBrains Mono', monospace; font-size:10.5px; letter-spacing:0.08em;
    text-transform:uppercase; color:var(--text-faint); text-align:center; margin-bottom:10px;
  }
  .ad-slot ins.adsbygoogle{ margin:0 auto; }

  .beta-tag{
    font-size:9.5px; font-weight:800; letter-spacing:0.04em;
    color:#fff; background:var(--danger); border-radius:999px; padding:2px 7px;
    text-transform:uppercase; display:inline-block;
  }

  .version-badge{
    position:fixed; bottom:12px; right:14px; font-family:'JetBrains Mono', monospace; font-size:10.5px; font-weight:600;
    color:var(--text-faint); background:var(--surface); border:1px solid var(--border); padding:3px 9px; border-radius:999px;
    opacity:0.85; letter-spacing:0.02em; pointer-events:none; z-index:50;
  }

  /* ---------- Footer ---------- */
  .site-footer{
    border-top:1px solid var(--border); margin-top:8px; padding:26px 20px 40px;
  }
  .footer-inner{
    max-width:var(--content-width); margin:0 auto; display:flex; align-items:center;
    justify-content:space-between; gap:14px; flex-wrap:wrap;
  }
  .footer-inner p{ margin:0; font-size:13px; color:var(--text-faint); }

  .mobile-capture-row{ margin-top:12px; text-align:center; }

  /* ---------- Botón flotante de feedback ---------- */
  .feedback-fab{
    position:fixed; right:20px; bottom:20px; z-index:150;
    width:52px; height:52px; border-radius:50%; padding:0;
    background:var(--accent); color:var(--accent-contrast); border:none; cursor:pointer;
    display:flex; align-items:center; justify-content:center;
    box-shadow:var(--shadow-lg); transition:background-color .15s, transform .15s;
  }
  .feedback-fab:hover{ background:var(--accent-hover); transform:translateY(-2px); }
  .feedback-fab svg{ width:23px; height:23px; }
  .feedback-form .lang-field{ margin-top:16px; max-width:none; }
  .feedback-form .lang-field:first-child{ margin-top:0; }
  .feedback-hp{ position:absolute; left:-9999px; width:1px; height:1px; overflow:hidden; }
  .feedback-intro{ margin:0 0 4px; font-size:13.5px; color:var(--text-soft); line-height:1.5; }

  @media (max-width: 640px){
    .feedback-fab{ right:14px; bottom:14px; width:48px; height:48px; }
    h1{ font-size:30px; }
    .sub{ font-size:15.5px; }
    .panel-wrap{ padding:24px 18px 26px; }
    .header-inner{ padding:14px 16px; }
  }